<?php 
//截取文章字数
	function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {
	        if(function_exists("mb_substr"))
	            $slice = mb_substr($str, $start, $length, $charset);
	        elseif(function_exists('iconv_substr')) {
	            $slice = iconv_substr($str,$start,$length,$charset);
	        }else{
	            $re['utf-8']   = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
	            $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
	            $re['gbk']    = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
	            $re['big5']   = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
	            preg_match_all($re[$charset], $str, $match);
	            $slice = join("",array_slice($match[0], $start, $length));
	        }
	        return $suffix ? $slice.'...' : $slice;
	    }

 ?>